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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef6c5a63b095748fa9c3f76379d0fa4df9096a2daf94d8ab7f2c56de941f2e6' 
  AND token = 'xp2JRycL+/mjIsdmreUzB2W9tGgAWuFpW0rUm0r3Zd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}